[thirdparty/squid.git] / src / DiskIO / AIO / AIODiskIOStrategy.h


/*
 * $Id$
 *
 * SQUID Web Proxy Cache          http://www.squid-cache.org/
 * ----------------------------------------------------------
 *
 *  Squid is the result of efforts by numerous individuals from
 *  the Internet community; see the CONTRIBUTORS file for full
 *  details.   Many organizations have provided support for Squid's
 *  development; see the SPONSORS file for full details.  Squid is
 *  Copyrighted (C) 2001 by the Regents of the University of
 *  California; see the COPYRIGHT file for full details.  Squid
 *  incorporates software developed and/or copyrighted by other
 *  sources; see the CREDITS file for full details.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * Copyright (c) 2003, Robert Collins <robertc@squid-cache.org>
 */

#ifndef SQUID_AIODISKIOSTRATEGY_H
#define SQUID_AIODISKIOSTRATEGY_H

#include "DiskIO/DiskIOStrategy.h"
#include "async_io.h"

class AIODiskIOStrategy : public DiskIOStrategy
{

public:
    AIODiskIOStrategy();
    virtual ~AIODiskIOStrategy();

    virtual bool shedLoad();
    /* What is the current load? 999 = 99.9% */
    virtual int load();
    /* Return a handle for performing IO operations */
    virtual RefCount<DiskFile> newFile (char const *path);
    /* flush all IO operations  */
    virtual void sync();
    /* unlink a file by path */
    virtual void unlinkFile (char const *);

    /* perform any pending callbacks */
    virtual int callback();

    /* Init per-instance logic */
    virtual void init();

    /* cachemgr output on the IO instance stats */
    virtual void statfs(StoreEntry & sentry)const;
    /* module specific options */
    virtual ConfigOption *getOptionTree() const;
    /* a file descriptor */
    int fd;
    /* queue of requests */
    async_queue_t aq;

    int findSlot();
};

#endif /* SQUID_AIODISKIOSTRATEGY_H */
Commit	Line	Data
59b2d47f	1
59b2d47f	2	/*
262a0e14	3	* $Id$
59b2d47f	4	*
	5	* SQUID Web Proxy Cache http://www.squid-cache.org/
	6	* ----------------------------------------------------------
	7	*
	8	* Squid is the result of efforts by numerous individuals from
	9	* the Internet community; see the CONTRIBUTORS file for full
	10	* details. Many organizations have provided support for Squid's
	11	* development; see the SPONSORS file for full details. Squid is
	12	* Copyrighted (C) 2001 by the Regents of the University of
	13	* California; see the COPYRIGHT file for full details. Squid
	14	* incorporates software developed and/or copyrighted by other
	15	* sources; see the CREDITS file for full details.
	16	*
	17	* This program is free software; you can redistribute it and/or modify
	18	* it under the terms of the GNU General Public License as published by
	19	* the Free Software Foundation; either version 2 of the License, or
	20	* (at your option) any later version.
26ac0430	21	*
59b2d47f	22	* This program is distributed in the hope that it will be useful,
	23	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	24	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	25	* GNU General Public License for more details.
26ac0430	26	*
59b2d47f	27	* You should have received a copy of the GNU General Public License
	28	* along with this program; if not, write to the Free Software
	29	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
	30	*
	31	* Copyright (c) 2003, Robert Collins <robertc@squid-cache.org>
	32	*/
	33
b9ae18aa	34	#ifndef SQUID_AIODISKIOSTRATEGY_H
b9ae18aa	35	#define SQUID_AIODISKIOSTRATEGY_H
59b2d47f	36
b9ae18aa	37	#include "DiskIO/DiskIOStrategy.h"
b9ae18aa	38	#include "async_io.h"
59b2d47f	39
b9ae18aa	40	class AIODiskIOStrategy : public DiskIOStrategy
59b2d47f	41	{
	42
	43	public:
b9ae18aa	44	AIODiskIOStrategy();
b9ae18aa	45	virtual ~AIODiskIOStrategy();
59b2d47f	46
b9ae18aa	47	virtual bool shedLoad();
	48	/* What is the current load? 999 = 99.9% */
	49	virtual int load();
	50	/* Return a handle for performing IO operations */
	51	virtual RefCount<DiskFile> newFile (char const *path);
	52	/* flush all IO operations */
	53	virtual void sync();
	54	/* unlink a file by path */
	55	virtual void unlinkFile (char const *);
	56
	57	/* perform any pending callbacks */
	58	virtual int callback();
59b2d47f	59
b9ae18aa	60	/* Init per-instance logic */
	61	virtual void init();
	62
	63	/* cachemgr output on the IO instance stats */
	64	virtual void statfs(StoreEntry & sentry)const;
	65	/* module specific options */
	66	virtual ConfigOption *getOptionTree() const;
	67	/* a file descriptor */
	68	int fd;
	69	/* queue of requests */
	70	async_queue_t aq;
	71
	72	int findSlot();
	73	};
59b2d47f	74
b9ae18aa	75	#endif /* SQUID_AIODISKIOSTRATEGY_H */